EP4345117A1 - Émulsion aqueuse de polyuréthane (wpu) et son procédé de préparation - Google Patents

Émulsion aqueuse de polyuréthane (wpu) et son procédé de préparation Download PDF

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Publication number
EP4345117A1
EP4345117A1 EP23150796.3A EP23150796A EP4345117A1 EP 4345117 A1 EP4345117 A1 EP 4345117A1 EP 23150796 A EP23150796 A EP 23150796A EP 4345117 A1 EP4345117 A1 EP 4345117A1
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EP
European Patent Office
Prior art keywords
wpu
parts
gloves
emulsion
chain extender
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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EP23150796.3A
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German (de)
English (en)
Inventor
GuoDa DAI
Wei Wen
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Shimu Special Protective Equipment Technology Jiangsu Co Ltd
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Shimu Special Protective Equipment Technology Jiangsu Co Ltd
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Publication of EP4345117A1 publication Critical patent/EP4345117A1/fr
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08Processes
    • C08G18/10Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/721Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
    • C08G18/722Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08Processes
    • C08G18/0804Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C08G18/0823Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08Processes
    • C08G18/10Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08Processes
    • C08G18/16Catalysts
    • C08G18/22Catalysts containing metal compounds
    • C08G18/24Catalysts containing metal compounds of tin
    • C08G18/244Catalysts containing metal compounds of tin tin salts of carboxylic acids
    • C08G18/246Catalysts containing metal compounds of tin tin salts of carboxylic acids containing also tin-carbon bonds
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30Low-molecular-weight compounds
    • C08G18/32Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3225Polyamines
    • C08G18/3228Polyamines acyclic
    • C08G18/3231Hydrazine or derivatives thereof
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30Low-molecular-weight compounds
    • C08G18/34Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C08G18/348Hydroxycarboxylic acids
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
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    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/48Polyethers
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
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    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666Compounds of group C08G18/48 or C08G18/52
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/73Polyisocyanates or polyisothiocyanates acyclic
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    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/74Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/02Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/07Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
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    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/02Direct processing of dispersions, e.g. latex, to articles
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    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08Cellulose derivatives
    • C08L1/26Cellulose ethers
    • C08L1/28Alkyl ethers
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • C09D175/08Polyurethanes from polyethers
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20Diluents or solvents
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
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Definitions

  • the present disclosure relates to the technical field of glove processing, and in particular, to a waterborne polyurethane (WPU) emulsion and a preparation method therefor.
  • WPU waterborne polyurethane
  • Dipped gloves also known as latex gloves, are one of the gloves. Different from ordinary gloves, the dipped gloves are made of latex. The dipped gloves are comfortable to wear after special surface treatment, and are necessary hand protection products, that have been widely used in industrial and agricultural production, medical treatment, beauty treatment and daily life.
  • Benzene, methanol, and acetic acid have short-term exposure concentrations of 404.1 mg/m 3 , 186.5 mg/m 3 , and 45.5 mg/m 3 respectively and time weighted average exposure concentrations of 212.2 mg/m 3 , 76.4 mg/m 3 , and 29.2 mg/m 3 respectively.
  • most factories use transparent plastic sheets to encapsulate the production line, which greatly reduces the concentration of chemical substances in the workshop, but does not fundamentally solve the problem of organic volatile pollution.
  • at least 40% of the organic solvents in the rubber are directly discharged into the air without treatment throughout the production process, causing serious environmental pollution.
  • the rubber used for labor protection gloves is gradually transferred to waterborne materials, most commonly latex gloves (i.e., natural rubber latex (NRL) gloves) and nitrile gloves.
  • NRL gloves themselves contain proteins that can cause skin allergies.
  • the nitrile gloves contain no protein and will not cause allergies to wearers, oligomers or part of monomers contained in nitrile latex are difficult to completely polymerize in the process of hot vulcanization, which is likely to cause odor and secondary pollution.
  • the WPU with water as a dispersion medium is non toxic, environmentally friendly, uninflammable, safe and reliable, not easy to damage the coated surface, energy saving, easy to operate, and easy to modify, and also has good solvent resistance, abrasion resistance, flexibility, and thermal stability, such that it is widely applied in leather finishing, fabrics, adhesives, and coatings.
  • the WPU has superior comprehensive performance and strong designability of molecular structure.
  • the WPU has surpassed other waterborne polymers in film formation, aging resistance, friction resistance, and strength.
  • the WPU has incomparable advantages over other waterborne materials, and is the preferred material for manufacturing high-performance labor protection glue gloves.
  • the core technical problems of low solid content, low curing speed, poor water resistance, and low initial viscosity of the WPU material for fabric core glue gloves are solved.
  • Foreign technology monopoly is broken through and surpassed. Environment-friendly production is realized. High value-added properties such as environmental protection, air permeability, waterproofness, high elasticity, hand feeling, and water resistance of the glue gloves are improved.
  • an objective of the present disclosure is to provide a WPU emulsion, which is prepared by adding a cellulose thickener at an emulsification stage to form a hydrogen bond between the cellulose thickener and water molecules at an initial stage of formation of polyurethane particles, so as to limit movement of the water molecules and make the particles collide and combine, thereby improving the abrasion resistance and flexibility, and prolonging the life of dipped gloves.
  • the WPU emulsion provided by the present disclosure includes the following raw materials in part by weight: 230-250 parts of polyol, 50-60 parts of isocyanate, 5-10 parts of a hydrophilic chain extender, 60-80 parts of a diluent, 5-9 parts of a neutralizer, 500-600 parts of water, 15-20 parts of a post chain extender, 0.01-0.05 parts of a catalyst, 3-7 parts of a cellulose thickener, 0.5-1.5 parts of a wetting agent, and 3-5 parts of a dispersant.
  • the polyol is one or more selected from the group consisting of polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, polysiloxane polyols, and polytetrahydrofuran (PTHF).
  • polyester polyols polyether polyols, polycaprolactone polyols, polycarbonate polyols, polysiloxane polyols, and polytetrahydrofuran (PTHF).
  • the isocyanate is one or two selected from the group consisting of isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI).
  • IPDI isophorone diisocyanate
  • HDI hexamethylene diisocyanate
  • the hydrophilic chain extender is 2,2-dimethylol propionic acid (DMPA).
  • DMPA 2,2-dimethylol propionic acid
  • the diluent is any one selected from the group consisting of dimethylacetamide (DMAC), acetone, N, N-dimethylformamide (DMF), and N-methylpyrrolidone (NMP).
  • DMAC dimethylacetamide
  • DMF N-dimethylformamide
  • NMP N-methylpyrrolidone
  • the neutralizer is triethylamine (TEAM).
  • the post chain extender is one or two selected from the group consisting of diethylenetriamine, ethylenediamine, isophorone diamine, and hydrazine hydrate.
  • the catalyst is organic tin or organic bismuth.
  • the cellulose thickener is carboxymethyl cellulose.
  • the wetting agent is polyether modified organosiloxane.
  • the dispersant is aryl ethyl phenyl polyethylene glycol ether.
  • the organic tin used in the present disclosure is dibutyltin dilaurate, which is T12 purchased from Shanghai Huihua Industrial Co., Ltd.
  • the organic bismuth is an organic bismuth catalyst, purchased from BiCAT of Xindian Chemistry Materials (Shanghai) Co., Ltd.
  • the cellulose thickener is carboxymethyl cellulose, purchased from CMC of Weifang Lude Chemical Co., Ltd.
  • the wetting agent is polyether modified organosiloxane, purchased from BYK348 of BYK Chemical.
  • the dispersant is aryl ethyl phenyl polyethylene glycol ether, the model of which is Fabricamul RL of H.J.Unkel (Shanghai) International Trading Co., Ltd.
  • Another objective of the present disclosure is to provide a preparation method for the WPU emulsion, including the following steps:
  • Knitted gloves are dipped with the WPU emulsion, and specific steps are as follows:
  • the present disclosure provides a WPU emulsion and a preparation method therefor.
  • the WPU emulsion is prepared by adjusting the raw materials, defining the particle size in the composition, and adding the cellulose thickener at the emulsification stage to form a hydrogen bond between the cellulose thickener and water molecules at an initial stage of formation of polyurethane particles, so as to limit movement of the water molecules and make the particles collide and combine.
  • the dipped gloves prepared with the above emulsion are perfectly combined with the fabric glove core, which has the characteristics of more excellent abrasion resistance and flexibility and long service life, and achieves more excellent wearing comfort than simple knitted gloves.
  • the dipped gloves prepared by the present disclosure have simple preparation process, short production cycle, high production capacity, and high cost-effectiveness.
  • a WPU emulsion included the following raw materials in part by weight: 270.74 parts of polyol, 50.56 parts of isocyanate, 7.82 parts of a hydrophilic chain extender, 36 parts of a diluent, 5.9 parts of a neutralizer, 541.66 parts of water, 17.21 parts of a post chain extender, 0.02 parts of a catalyst, 3.6 parts of a cellulose thickener, 2.2 parts of a wetting agent, and 1.8 parts of a dispersant.
  • the polyol was PTHF 1000.
  • the isocyanate consisted of 25.56 parts of IPDI and 25 parts of HDI.
  • the hydrophilic chain extender was 2,2-dimethylol propionic acidDMPA.
  • the diluent was acetone.
  • the neutralizer was TEAM.
  • the post chain extender was hydrazine hydrate.
  • the catalyst was dibutyltin dilaurate.
  • the cellulose thickener was carboxymethyl cellulose.
  • the wetting agent was polyether modified organosiloxane.
  • the dispersant was aryl ethyl phenyl polyethylene glycol ether.
  • a preparation method for the WPU emulsion included the following steps.
  • the polyol and the hydrophilic chain extender were put into a reactor, The isocyanate was added while stirring at 150 r/min. The catalyst was added after a temperature rose to 80°C. Nitrogen was introduced. Heat preservation was conducted for 3 h to obtain the isocyanate terminated prepolymer.
  • the diluent and the neutralizer were added to neutralize the isocyanate terminated prepolymer to obtain a neutralized prepolymer.
  • Step III emulsification
  • the neutralized prepolymer in step II was added into the water to obtain a mixture, and the mixture was stirred at 3,200 r/min (high speed stirring) for 30 min to form a dispersion.
  • the post chain extender was added to the dispersion in step III, and stirred for 30 min to obtain a WPU dispersion.
  • a particle size was limited to 20-30 ⁇ m during chain extension.
  • Step V preparation of emulsion
  • the cellulose thickener, the wetting agent, and the dispersant were added into the WPU dispersion, and stirred for 30 min to obtain the WPU emulsion.
  • a method for preparing dipped gloves with the above WPU emulsion included the following specific steps.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Gloves (AREA)
EP23150796.3A 2022-09-30 2023-01-09 Émulsion aqueuse de polyuréthane (wpu) et son procédé de préparation Pending EP4345117A1 (fr)

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JP7462083B1 (ja) 2024-04-04
US11958934B1 (en) 2024-04-16

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